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I highly recommend that when you replace pressure switches that you verify that they actually work before installation.

I replaced my original low pressure indicator switch because it was leaking. 

After dropping the lighter than air hydraulic cooler, removing and reconnecting a new switch, and bolting the hydraulic cooler back in I found out that the switch although not leaking did not turn off the "low air" light on the dash any more.  

So now I get to look at that until I get back in Simons pit to replace the switch again.  However this time I will verify that the switch actually works......

Often times there could be multiple switches in parallel, any one switch can turn on the light. You may need to make sure that there is not another switch on the circuit.